Bag type dust collector for railway ballast bed sewage suction truck

Abstract

The utility model relates to a bag type dust collector for a railway ballast bed sewage suction truck. The bag type dust collector comprises a plurality of ash buckets, a plurality of filtration chambers; the air suction assembly comprises a plurality of dispersion covers and a plurality of air suction pipes, and the outlet end of each air suction pipe communicates with the corresponding dispersion cover; the plurality of ash buckets are divided into a plurality of ash bucket groups along the airflow direction, and each ash bucket group at least comprises two adjacent ash buckets; each dust hopper group is at least matched with one dispersion cover, a plurality of guide plates are arranged in the dispersion cover, the guide plates are distributed at intervals in the flow direction of the airflow, and the arrangement heights of the guide plates are sequentially increased in the flow direction of the airflow, so that the airflow flows downwards after being decelerated and dispersed and homogenized in the dispersion cover. According to the bag type dust collector disclosed by the utility model, the structure of the air suction assembly is optimized, so that the balance of air volume and the uniformity of sewage suction are ensured, the uniformity of longitudinal ash load and transverse ash load of each chamber of the bag type dust collector is ensured, the working efficiency of the bag type dust collector is improved, the running resistance is reduced, and the service life of a filter material in the filter chamber is prolonged.

Description

Technical Field

[0001] This utility model relates to the technical field of railway track bed vacuum trucks, and in particular to a bag filter for railway track bed vacuum trucks. Background Technology

[0002] The surface of railway track beds often accumulates dust, solid debris, small stones, and rail grinding shavings. When trains pass at high speeds, these contaminants can be swept up by the airflow and damage the train's sensors. Therefore, frequent cleaning of the track bed using a track bed vacuum truck is necessary. Existing track bed vacuum trucks are typically equipped with bag filters to remove dust from the vacuumed material before discharging it. Their operating speed (the speed at which the vacuum truck travels on the track bed during operation) is approximately 10 km / h, and their off-duty speed is approximately 100 km / h. This application scenario places demands on the bag filters of the track bed vacuum trucks to be compact, have a large air volume handling capacity, and maintain a balanced dust load across both the horizontal and vertical cross sections. To ensure the effective vacuuming of the railway track bed vacuum truck and to ensure a smooth connection between the bag filter and the working trolley's duct within a limited space, the airflow velocity in the bag filter's suction duct exceeds 50 m / s, and the filtration velocity of the bag filter is 4 m / s.

[0003] like Figure 1 As shown, a bag filter typically includes a bag filter assembly, multiple dust hoppers 1, and three suction pipes. The bag filter assembly includes multiple filter chambers 2, and the dust hoppers 1 are correspondingly located below each filter chamber 2. A collection chamber 3a is provided between the bag filter assembly and the suction pipes. The three suction pipes of the same diameter are at the same horizontal position and are connected to the collection chamber 3a respectively. Due to the high flow velocity in the suction pipes, in order to avoid the airflow entering the collection chamber 3a being too fast and strongly impacting the filter chambers 2, the inlet end of the suction pipe in the collection chamber 3a is guided by an upward exhaust elbow 4a. In this way, the airflow introduced into the collection chamber 3a by the suction pipe flows upward through the elbow 4a, without directly impacting the filter chambers 2. Furthermore, the upward impact of the airflow on the top plate of the collection chamber 3a creates turbulence, which can balance the cross-sectional airflow distribution. Then, the airflow flows downward to the first filter bag and the first dust hopper.

[0004] The above scheme, due to the setting of the collection chamber 3a, causes the airflow from the three suction pipes to first recirculate in the collection chamber 3a before being distributed, resulting in uncontrollable airflow and ash load uniformity. This scheme has two relatively obvious drawbacks:

[0005] (1) Since the three suction pipes are at the same horizontal position, the connection points between the three suction pipes and the collection chamber 3a are at different positions at the same horizontal height, resulting in different pressure losses at these three connection points, which in turn leads to uneven suction effect of the three suction pipes.

[0006] (2) As the dirt enters the collection chamber 3a, it moves upward first, hits the top plate of the collection chamber 3a and bounces back to the bottom. As a result, the dirt loses its horizontal kinetic energy. Driven by the airflow generated by the fan, the dirt moves into the space between the filter chamber 2 and the ash hopper 1. The large dirt has a large weight and is not easily driven upward by the airflow. It will fall into the first ash hopper 1. Some of the medium-sized dirt falls into the first ash hopper 1, and some settles and moves to the second ash hopper 1. The small dirt will enter the filter chamber 2 with the airflow, be intercepted by the filter bag, and settle evenly in each ash hopper 1 through the jet cleaning process. As the dirt in the track bed contains a lot of large dirt, the ash load in the first ash hopper 1 is much higher than that in other ash hoppers. The ash load in each part in the longitudinal and transverse directions is very different. In addition, in order to prevent the filter bag from being flushed after the ash is full, the ash needs to be unloaded frequently, which greatly reduces the working efficiency. The lateral ash load distribution of the bag filter is affected by the dust mixing distribution in the collecting chamber 3a, and the lateral ash load distribution is relatively unbalanced. Utility Model Content

[0007] Based on the aforementioned deficiencies in the existing technology, the purpose of this utility model is to provide a bag filter that optimizes the structure of the suction component to ensure balanced airflow, uniform dust collection, uniform longitudinal and transverse ash load in each chamber of the bag filter, improve the working efficiency of the bag filter, reduce operating resistance, and extend the service life of the filter media in the filter chamber.

[0008] Therefore, the present invention provides the following technical solution.

[0009] This utility model provides a bag filter for a railway track bed vacuum truck, the bag filter comprising:

[0010] Multiple ash hoppers, used to collect waste;

[0011] Multiple filter chambers are used to filter dust-laden airflow;

[0012] A suction assembly is located between the plurality of ash hoppers and the plurality of filter chambers; the suction assembly includes a plurality of dispersion hoods and a plurality of suction pipes arranged side by side along a first horizontal direction, the outlet end of each suction pipe being connected to a dispersion hood, the opening of the dispersion hood facing downwards;

[0013] The housing, the plurality of filter chambers and the suction assembly are all located inside the housing, and the plurality of ash hoppers are connected to the lower part of the housing;

[0014] The plurality of ash hoppers are divided into multiple ash hopper groups along the airflow direction, and each ash hopper group includes at least two adjacent ash hoppers; each ash hopper group is matched with at least one dispersion hood, and the inlet of each ash hopper in the ash hopper group is opposite to the opening of the corresponding dispersion hood.

[0015] The dispersion hood is provided with multiple guide plates, which are arranged vertically and distributed at intervals along the airflow direction. The height of the multiple guide plates increases sequentially along the airflow direction. The multiple guide plates are used to slow down and disperse the airflow entering the dispersion hood before it flows downward.

[0016] Optionally, the plurality of ash hoppers are distributed sequentially along the second horizontal direction, and the plurality of filter chambers are distributed sequentially along the second horizontal direction and are arranged one-to-one above the ash hoppers.

[0017] Optionally, all the dispersion shields are spaced apart along the second horizontal direction;

[0018] And / or, the second horizontal direction is perpendicular to the first horizontal direction.

[0019] Optionally, the longitudinal section of the top of the dispersion hood is inverted V-shaped.

[0020] Optionally, the suction assembly includes a first suction pipe, a second suction pipe, and a third suction pipe arranged side by side in a first horizontal direction. The outlet end of the first suction pipe is connected to a first dispersion hood, the outlet end of the second suction pipe is connected to a second dispersion hood, and the outlet end of the third suction pipe is connected to a third dispersion hood.

[0021] The length of the second suction pipe is less than the length of the first suction pipe, which is less than the length of the third suction pipe. The second dispersion cover, the first dispersion cover, and the third dispersion cover are spaced apart along the second horizontal direction.

[0022] Optionally, there are six ash hoppers and six filter chambers. The six ash hoppers are divided into a first ash hopper group, a second ash hopper group and a third ash hopper group along the airflow direction. Each ash hopper group includes two ash hoppers.

[0023] The openings of the first dispersion hood are respectively opposite to the two ash hoppers of the first ash hopper group, the openings of the second dispersion hood are respectively opposite to the two ash hoppers of the second ash hopper group, and the openings of the third dispersion hood are respectively opposite to the two ash hoppers of the third ash hopper group.

[0024] Optionally, the first suction pipe includes a first inlet straight pipe, a first bend section, a first straight pipe section and a second bend section on the same horizontal plane connected in sequence; the second suction pipe includes a second inlet straight pipe, a third bend section and a second straight pipe section connected in sequence; and the third suction pipe includes a third inlet straight pipe, a fourth bend section, a third straight pipe section and a fifth bend section on the same horizontal plane connected in sequence.

[0025] The first bend, the third bend, and the fourth bend are arranged side by side. The first bend bends downward in a direction away from the third bend, the third bend bends downward, and the fourth bend is arranged symmetrically with respect to the first bend about the central axis of the first inlet straight pipe.

[0026] The first inlet straight pipe and the first straight pipe section extend along a second horizontal direction, and the second bend section connects the first straight pipe section and the first dispersion hood; the axes of the second inlet straight pipe, the third bend section, and the second straight pipe section are in the same vertical plane, the second inlet straight pipe and the second straight pipe section extend along a second horizontal direction, and the second straight pipe section connects to the second dispersion hood; the third inlet straight pipe and the third straight pipe section extend along a second horizontal direction, and the fifth bend section connects the third straight pipe section and the third dispersion hood.

[0027] Optionally, the inner diameters of the first suction pipe, the second suction pipe, and the third suction pipe are equal, and the inner diameter R1 ≤ 450 mm;

[0028] The first bend and the fourth bend have the same bending radius, and 175 mm ≤ bending radius R2 ≤ 215 mm; the third bend has a bending radius of R3, and 90 mm ≤ bending radius R3 ≤ 110 mm; the second bend and the fifth bend have the same bending radius, and 185 mm ≤ bending radius R4 ≤ 225 mm.

[0029] Optionally, the guide plate includes a first horizontal plate, a vertical plate, and a second horizontal plate connected in sequence. The first horizontal plate, the vertical plate, and the second horizontal plate together form a cavity, and the opening of the cavity is opposite to the outlet end of the corresponding air intake pipe.

[0030] Optionally, the outlet end of the suction pipe extends along a second horizontal direction, the first horizontal plate is located above the second horizontal plate, the width of the first horizontal plate and the width of the second horizontal plate extend along the second horizontal direction respectively, and the vertical plate extends along a vertical direction; the width of the first horizontal plate is greater than the width of the second horizontal plate; the second horizontal direction is perpendicular to the first horizontal direction.

[0031] And / or, in the same dispersion hood, the height difference between the top walls of two adjacent guide plates is ΔH, the cross-sectional area of ​​the outlet end of the suction pipe corresponding to the height difference ΔH is S1, and the total cross-sectional area of ​​the outlet end of the suction pipe is S2, S1=S2 / (n+1), where n is the number of guide plates in the dispersion hood.

[0032] This utility model has the following technical effects:

[0033] This utility model provides a bag filter dust collector. Each suction pipe independently transports dirt to the corresponding ash hopper group. The single-line pipeline design simplifies airflow distribution, balances the load of each ash hopper, and balances the longitudinal ash load. Each ash hopper group evenly distributes the load on large and medium-sized dirt. In addition, a dispersion hood is configured at the outlet end of each suction pipe, and each ash hopper group is matched with at least one dispersion hood. Multiple guide plates are set in the dispersion hood, and the positional relationship of all guide plates is defined. In this way, while reducing or avoiding the pressure loss difference at the outlet ends of the three suction pipes, it can also ensure that the airflow can be better uniform at the outlet position of the dispersion hood. This ensures that the amount of flue gas and dust entering each ash hopper through each suction pipe through the corresponding dispersion hood is balanced, the airflow in each chamber is more uniform, and the lateral ash load is more balanced, avoiding the need for frequent ash unloading due to excessive load in individual ash hoppers. The suction components in this solution ensure balanced airflow and uniform dust collection, guaranteeing the uniformity of longitudinal and transverse dust load in each chamber of the bag filter. This improves the working efficiency of the bag filter, reduces operating resistance, and extends the service life of the filter media in the filter chamber. Attached Figure Description

[0034] Figure 1 This is a structural diagram of a bag filter in the prior art;

[0035] Figure 2 This is a top view of the suction assembly of this utility model;

[0036] Figure 3 This is a side view of the suction assembly of this utility model;

[0037] Figure 4 This is a rear view of the suction assembly of this utility model;

[0038] Figure 5 This is a side view of the bag filter of this utility model;

[0039] Figure 6 This is a top view of the bag filter of this utility model;

[0040] Figure 7 This is a rear view of the bag filter of this utility model;

[0041] Figure 8 This is a front view of the first dispersion hood of this utility model;

[0042] Figure 9 This is a side view of the first dispersion hood of this utility model;

[0043] Figure 10 This is a velocity distribution cloud map of the mid-section of the bag filter during the simulation calculation of this utility model;

[0044] Figure 11 This is a vector diagram of the speed of the bag filter during the simulation calculation of this utility model;

[0045] Figure 12 This is a velocity distribution cloud map of a section 100mm below the filter chamber during the simulation calculation of this utility model;

[0046] Figure 13 This is a cloud-line diagram of the airflow velocity during the simulation calculation of this utility model.

[0047] Explanation of reference numerals in the attached figures

[0048] 100. Baghouse dust collector;

[0049] 1. Ash hopper;

[0050] 2. Filter chamber;

[0051] 3. Suction assembly;

[0052] 31. First suction pipe; 311. First inlet straight pipe; 312. First bend section; 313. First straight pipe section; 314. Second bend section;

[0053] 32. Second suction pipe; 321. Second inlet straight pipe; 322. Third bend section; 323. Second straight pipe section;

[0054] 33. Third suction pipe; 331. Third inlet straight pipe; 332. Fourth bend section; 333. Third straight pipe section; 334. Fifth bend section;

[0055] 34. First dispersion hood; 341. First sidewall; 342. Second sidewall; 343. Third sidewall; 35. Second dispersion hood; 36. Third dispersion hood;

[0056] 37. Guide plate; 371. First transverse plate; 372. Vertical plate; 373. Second transverse plate; 374. Cavity;

[0057] 4. Outer shell;

[0058] 3a. Collecting chamber; 4a. Elbow. Detailed Implementation

[0059] To make the technical solution and beneficial effects of this utility model more apparent and understandable, a detailed description is provided below by listing specific embodiments. Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.

[0060] In the description of this utility model, unless otherwise expressly defined, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. That is, they should not be construed as limitations on this utility model.

[0061] In this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" can explicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two; "several" means at least one; unless otherwise expressly defined.

[0062] In this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "linking," "fixing," and "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral molding; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0063] In this utility model, unless otherwise explicitly defined, the terms "above," "on top of," "above," "over," "below," "below," "below," or "below" for "first feature above second feature" can refer to direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Furthermore, "above," "above," and "over" for "first feature above second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature below second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0064] In this utility model, "first horizontal direction a" and "second horizontal direction b" both refer to... Figures 1 to 7 The markings in the text shall prevail.

[0065] The following is based on Figures 2 to 13 This invention relates to a bag filter dust collector.

[0066] In this embodiment, the bag filter 100 is used in a railway track bed vacuum truck, such as... Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the bag filter 100 includes multiple dust hoppers 1, multiple filter chambers 2, a suction assembly 3, and a housing 4. All filter chambers 2 and suction assemblies 3 are located inside the housing 4. All dust hoppers 1 are connected to the lower part of the housing 4. The dust hoppers 1 are located below the filter chambers 2. The dust hoppers 1 cooperate with the corresponding filter chambers 2 to form corresponding waste treatment chambers. The dust hoppers 1 are used to collect waste. The filter chambers 2 include multiple filter bags (e.g., fifteen filter bags). The filter chambers 2 filter the dust-laden airflow through the filter bags. The suction assembly 3 is located between the dust hoppers 1 and the filter chambers 2. The suction assembly 3 includes multiple dispersion hoods and multiple suction pipes arranged side by side along the first horizontal direction a. The outlet end of each suction pipe is connected to a dispersion hood, and the opening of the dispersion hood faces downward.

[0067] All ash hoppers 1 are divided into multiple ash hopper groups along the airflow direction, with each ash hopper group including at least two adjacent ash hoppers 1. Each ash hopper group is matched with at least one dispersion hood, and the inlet of each ash hopper 1 in the ash hopper group is opposite to the opening of the corresponding dispersion hood. Each air inlet pipe operates independently, delivering the sucked-up dirt to the matched dispersion hood. The dirt is dispersed in the dispersion hood and then moves to the corresponding ash hopper 1. Compared with the existing technology that sets up a collection chamber 3a, this solution eliminates the collection chamber 3a, which can reduce or avoid the pressure loss difference at the outlet ends of the three suction pipes, thereby improving the uniformity of the dirt suction effect of the three suction pipes.

[0068] In addition, each dispersion hood is equipped with multiple guide plates 37, which are vertically arranged and spaced apart along the airflow direction. The height of all guide plates 37 increases sequentially along the airflow direction. Thus, when the dust-laden airflow from the suction pipe enters the corresponding dispersion hood, part of the airflow is blocked by the first guide plate 37 and cannot move forward, flowing downwards; part of the airflow is blocked by the second guide plate 37 and cannot move forward, flowing downwards, and so on, until the remaining airflow impacts the inner wall of the dispersion hood and moves downwards. By setting multiple guide plates 37 in the dispersion hood and limiting the positional relationship of all guide plates 37, within the limited space of the dispersion hood, the high-speed airflow entering the dispersion hood can be quickly reduced in velocity and rapidly homogenized, exiting at a low speed and evenly from the outlet of the dispersion hood. This avoids high-speed airflow entering the ash hopper 1 and causing secondary dust generation, and also avoids excessively concentrated airflow discharge leading to large load differences in each ash hopper 1, thereby improving the dust removal efficiency.

[0069] The above technical solution allows each suction pipe to independently transport waste to the corresponding ash hopper group. The single-line pipeline design simplifies airflow distribution, balances the load of each ash hopper and the longitudinal ash load, and evenly distributes the load on large and medium-sized waste in each ash hopper group. In addition, a dispersion hood is configured at the outlet end of each suction pipe, and each ash hopper group is matched with at least one dispersion hood. Multiple guide plates 37 are set in the dispersion hood, and the positional relationship of all guide plates 37 is defined. This can reduce or avoid pressure loss differences at the outlet ends of the three suction pipes, and also ensure that the airflow can be better uniform at the outlet position of the dispersion hood. This ensures that the amount of flue gas and dust entering each ash hopper 1 through each suction pipe through the corresponding dispersion hood is balanced, the airflow in each chamber is more uniform, the lateral ash load is more balanced, and frequent ash unloading is avoided due to excessive load in individual ash hopper 1. The suction component 3 in this solution can ensure balanced airflow and uniform dust collection, ensuring the uniformity of longitudinal and transverse dust load in each chamber of the bag filter 100, improving the working efficiency of the bag filter 100, reducing operating resistance, and extending the service life of the filter media in the filter chamber.

[0070] In one embodiment, to facilitate the miniaturization design of the bag filter 100, such as Figure 5 As shown, all the ash hoppers 1 are distributed sequentially along the second horizontal direction b, and all the filter chambers 2 are distributed sequentially along the second horizontal direction b and are correspondingly arranged above the ash hoppers 1. One ash hopper 1 and one filter chamber 2 constitute a sewage treatment chamber. Specifically, when the railway track bed vacuum truck is cleaning, it moves forward along the track bed. The second horizontal direction b is in the front-rear direction of the railway track bed vacuum truck. This helps to reduce the width of the railway track bed vacuum truck, facilitating rapid movement in railway application scenarios. Of course, the arrangement of ash hoppers 1 and filter chambers 2 is not limited to this. All ash hoppers 1 can be staggered, all filter chambers 2 can also be staggered, and one filter chamber 2 can also correspond to two ash hoppers 1.

[0071] In one implementation, such as Figure 2 As shown, all the dispersion hoods are spaced apart along the second horizontal direction b, making the arrangement more compact and facilitating the arrangement of multiple independent air inlet pipes and matching dispersion hoods within the limited space of the bag filter 100.

[0072] In one implementation, such as Figure 2 As shown, the second horizontal direction b is perpendicular to the first horizontal direction a, which helps to reduce the space occupied by the suction component 3.

[0073] In one implementation, such as Figure 4 and Figure 7As shown, the longitudinal section of the top of the dispersion hood is inverted V-shaped, and the top of the dispersion hood is pointed, which can reduce or avoid dust accumulation on the inner top wall of the dispersion hood. Specifically, according to the required angle of repose of the load dust, the inclination angle of the inner top wall of the dispersion hood is designed so that dust is not easy or will not accumulate on the inner top wall of the dispersion hood, ensuring the dust removal effect. The cross-section of the hood body can be square or circular, and the diameter of the outlet of the dispersion hood should be as large as possible to ensure better airflow dispersion.

[0074] In one implementation, such as Figure 2 As shown, the suction assembly 3 includes a first suction pipe 31, a second suction pipe 32, and a third suction pipe 33 arranged side by side in the first horizontal direction a. The three suction pipes can simultaneously suction three areas of the track bed, while avoiding an excessively large baghouse dust collector 100 due to an excessive number of suction pipes. The outlet end of the first suction pipe 31 is connected to a first dispersion hood 34, the outlet end of the second suction pipe 32 is connected to a second dispersion hood 35, and the outlet end of the third suction pipe 33 is connected to a third dispersion hood 36. The first dispersion hood 34, the second dispersion hood 35, and the third dispersion hood 36 have the same structure and dimensions, but the number of guide plates configured in each dispersion hood can be different. The length of the second suction pipe 32 is less than the length of the first suction pipe 31, which is less than the length of the third suction pipe 33. The second dispersion hood 35, the first dispersion hood 34, and the third dispersion hood 36 are spaced apart along the second horizontal direction b, resulting in a compact arrangement of components, which is beneficial for the miniaturization design of the suction assembly 3.

[0075] Furthermore, such as Figure 5 As shown, there are six ash hoppers 1 and six filter chambers 2. The six ash hoppers 1 are divided into a first ash hopper group, a second ash hopper group, and a third ash hopper group along the airflow direction. Each ash hopper group includes two ash hoppers 1. That is, the first ash hopper 1 and the second ash hopper 1 form the first ash hopper group, the third ash hopper 1 and the fourth ash hopper 1 form the second ash hopper group, and the fifth ash hopper 1 and the sixth ash hopper 1 form the third ash hopper group. The openings of the second dispersion hood 35 are respectively opposite to the two ash hoppers 1 of the first ash hopper group, the openings of the first dispersion hood 34 are respectively opposite to the two ash hoppers 1 of the second ash hopper group, and the openings of the third dispersion hood 36 are respectively opposite to the two ash hoppers 1 of the third ash hopper group.

[0076] When the railway track bed vacuum truck is in operation, the sewage drawn in by the first suction pipe 31 is decelerated and homogenized by the first dispersion hood 34 before being discharged. Most of the sewage is evenly distributed into the third and fourth ash hoppers 1, while a small portion is filtered in the third and fourth filter chambers 2. Similarly, the sewage drawn in by the second suction pipe 32 is decelerated and homogenized by the second dispersion hood 35 before being discharged. Most of the sewage is evenly distributed into the first and second ash hoppers 1, while a small portion is filtered in the first and second filter chambers 2. Finally, the sewage drawn in by the third suction pipe 33 is decelerated and homogenized by the third dispersion hood 36 before being discharged. Most of the sewage is evenly distributed into the fifth and sixth ash hoppers 1, while a small portion is filtered in the fifth and sixth filter chambers 2. This design achieves a more balanced load on each ash hopper 1, avoiding frequent unloading due to excessive load on any single ash hopper 1.

[0077] Of course, the number of ash hoppers 1 and filter chambers 2 is not limited to six; it can be two, four, eight, or even more. Of course, the number of ash hoppers 1 does not have to be equal to the number of filter chambers 2, and the number of ash hoppers 1 in each ash hopper group can also exceed two.

[0078] Furthermore, due to space constraints within the baghouse dust collector 100, the size of the dispersion hood cannot be too large, which would result in excessive spacing between the three suction pipes. Figure 5 As shown, the inlets of the two ash hoppers 1 of the ash hopper group are not completely covered by the dispersion cover. This way, the upward flow of air to the filtration zone is not affected, nor is the falling of dirt into the ash hopper 1.

[0079] Furthermore, such as Figures 2 to 4As shown, the first suction pipe 31 includes a first inlet straight pipe 311, a first bend section 312, a first straight pipe section 313 and a second bend section 314 connected in sequence on the same horizontal plane; the second suction pipe 32 includes a second inlet straight pipe 321, a third bend section 322 and a second straight pipe section 323 connected in sequence; and the third suction pipe 33 includes a third inlet straight pipe 331, a fourth bend section 332, a third straight pipe section 333 and a fifth bend section 334 connected in sequence on the same horizontal plane. The first bend section 312, the third bend section 322, and the fourth bend section 332 are arranged side by side. The first bend section 312 bends downward away from the third bend section 322, the third bend section 322 bends downward, and the fourth bend section 332 is symmetrical to the first bend section 312 about the central axis of the first inlet straight pipe 311. The bending angle between the fourth bend section 332 and the first bend section 312 should not be too large to avoid making the suction assembly 3 too large. It is only necessary to ensure that adjacent air inlet pipes do not interfere with each other. The first inlet straight pipe 311 and the first straight pipe section 313 extend along the second horizontal direction b, respectively. The second bend section 314 is used to connect the first straight pipe section 313 and the first dispersion hood 34. The axes of the second inlet straight pipe 321, the third bend section 322, and the second straight pipe section 323 are in the same vertical plane. The second inlet straight pipe 321 and the second straight pipe section 323 extend along the second horizontal direction b, and the second straight pipe section 323 is connected to the second dispersion hood 35. The third inlet straight pipe 331 and the third straight pipe section 333 extend along the second horizontal direction b, and the fifth bend section 334 is used to connect the third straight pipe section 333 and the third dispersion hood 36. The suction assembly 3 of this scheme has a compact structure and simple airflow distribution, and can be applied to the bag filter 100 with limited space. This scheme can use an elbow structure as the bend section.

[0080] Furthermore, such as Figure 2 As shown, the inner diameters of the first suction pipe 31, the second suction pipe 32, and the third suction pipe 33 are equal, with an inner diameter R1 ≤ 450 mm, to ensure effective suction. The bending radii of the first bend section 312 and the fourth bend section 332 are equal, with 175 mm ≤ bending radius R2 ≤ 215 mm; the bending radius of the third bend section 322 is R3, with 90 mm ≤ bending radius R3 ≤ 110 mm; the bending radii of the second bend section 314 and the fifth bend section 334 are equal, with 185 mm ≤ bending radius R4 ≤ 225 mm. In this design, the dimensions of each pipe section reduce the resistance encountered by the fluid moving within the pipes, ensuring balanced resistance across all pipes and contributing to balanced ash load.

[0081] Furthermore, such as Figure 2As shown, when viewed from above, the maximum angle α between either the first bend section 312 or the fourth bend section 332 and the first suction pipe 31 is 39.12°. Figure 4 As shown, when the suction assembly 3 is viewed directly from the inlet end of the suction pipe, the angle β between either the first bend section 312 or the fourth bend section 332 and the first suction pipe 31 is 28°.

[0082] In one implementation, such as Figure 3 As shown, the guide plate 37 includes a first horizontal plate 371, a vertical plate 372, and a second horizontal plate 373 connected in sequence, as follows: Figure 2 As shown, the length of the guide plate 37 extends along the first direction a, and the two sides of the guide plate 37 in the first direction a are respectively connected to the inner walls of the two sides of the corresponding dispersion shroud, as shown. Figure 3 As shown, the first horizontal plate 371 is located above the second horizontal plate 373. The first horizontal plate 371, the vertical plate 372, and the second horizontal plate 373 together form a cavity 374, and the opening of the cavity 374 is opposite to the outlet end of the corresponding suction pipe. In this way, when the airflow in the suction pipe enters the cavity 374 of the guide plate 37, the airflow will circulate in the cavity 374, and part of the airflow will collide with the first horizontal plate 371 and flow downward, so that the airflow is maximized to a uniform degree at the outlet position of the dispersion hood.

[0083] Furthermore, such as Figure 3 As shown, the outlet end of the suction pipe extends along the second horizontal direction b. The widths of the first horizontal plate 371 and the second horizontal plate 373 extend along the second horizontal direction b, respectively, while the vertical plate 372 extends vertically. The width of the first horizontal plate 371 is greater than the width of the second horizontal plate 373, ensuring a certain airflow velocity while homogenizing the airflow and maintaining dust removal efficiency. Preferably, the width of the first horizontal plate 371 is 50 mm, the height of the vertical plate 372 is 250 mm, and the width of the second horizontal plate 373 is 30 mm.

[0084] In one implementation, such as Figure 2 , Figure 3 and Figure 5 As shown, the second dispersion hood 35 has three guide plates 37, with two guide plates 37 located above the first ash hopper 1 and the remaining guide plate 37 located above the second ash hopper 1; the first dispersion hood 34 has three guide plates 37, with two guide plates 37 located above the third ash hopper 1 and the remaining guide plate 37 located above the fourth ash hopper 1; the third dispersion hood 36 has three guide plates 37, with two guide plates 37 located above the fifth ash hopper 1 and the remaining guide plate 37 located above the sixth ash hopper 1.

[0085] In one implementation, such as Figure 3 As shown, in the same dispersion hood, the height difference between the top walls of two adjacent guide plates 37 is ΔH, and the cross-sectional area of ​​the outlet end of the suction pipe corresponding to the height difference ΔH is S1, and the total cross-sectional area of ​​the outlet end of the suction pipe is S2, S1=S2 / (n+1), where n is the number of guide plates in the dispersion hood. Taking the second dispersion hood 35 as an example, the second dispersion hood 35 has three guide plates 37. In the direction of airflow, there is a height difference ΔH1 between the first transverse plates 371 of the first guide plate 37 and the second guide plate 37, and a height difference ΔH2 between the first transverse plates 371 of the second guide plate 37 and the third guide plate 37. The cross-sectional area of ​​the outlet end of the second suction pipe 32 between the first transverse plates 371 of the first guide plate 37 and the second guide plate 37 is S1. The total cross-sectional area of ​​the outlet end of the second suction pipe 32 between the first transverse plates 371 of the second guide plate 37 and the third guide plate 37 is S2. S1 = S2 / (7 + 1).

[0086] In one implementation, such as Figure 8 As shown, the three dispersion hoods have the same structure. Taking the first dispersion hood 34 as an example, the first sidewall 341 of the first dispersion hood 34 extends vertically towards the first air inlet duct 31. The side of the first dispersion hood 34 facing away from the first air inlet duct 31 includes a second sidewall 342 and a third sidewall 343. The second sidewall 342 forms a pointed sidewall and extends downwards at an angle away from the first air inlet duct 31. The top of the third sidewall 343 is connected to the second sidewall 342 and extends vertically. The bottom wall of the first dispersion hood 34 extends horizontally. In this design, the second sidewall 342 is inclined to further reduce or prevent dust accumulation on the top wall inside the dispersion hood.

[0087] In one specific implementation, the fluid simulation software Fluent is used for simulation calculations. For example... Figures 2 to 7 As shown, the structure of the bag filter 100 is as follows:

[0088] The bag filter 100 includes six dust hoppers 1, six filter chambers 2, and a suction assembly 3. The six dust hoppers 1 are arranged sequentially along a second horizontal direction b. Each filter chamber 2 contains 15 filter bags. The six filter chambers 2 are arranged sequentially along the second horizontal direction b and are correspondingly positioned above the dust hoppers 1. The six dust hoppers 1 are grouped in pairs to form three dust hopper groups. The suction assembly 3 includes a first suction pipe 31, a second suction pipe 32, and a third suction pipe 33 arranged side by side along a first horizontal direction a. The outlet end of the first suction pipe 31 is connected to a first dispersion hood 34. The outlet end of the second suction pipe 32 is connected to a second dispersion hood 35. The outlet end of the third suction pipe 33 is connected to a third dispersion hood 36. The openings of the second dispersion hood 35 are respectively opposite to two dust hoppers 1 in the first dust hopper group, the openings of the first dispersion hood 34 are respectively opposite to two dust hoppers 1 in the second dust hopper group, and the openings of the third dispersion hood 36 are respectively opposite to two dust hoppers 1 in the third dust hopper group. The first dispersion hood 34, the second dispersion hood 35, and the third dispersion hood 36 are all pointed structures, and their structures and dimensions are identical. The first dispersion hood 34 will be used as an example for further explanation. Figure 8 and Figure 9 As shown, the included angle γ of the tip of the first dispersion hood 34 is 83°, the height H1 of the first dispersion hood 34 is 550mm, the height H2 of the tip is 450mm, the length L1 of the bottom wall of the first dispersion hood 34 is 1580mm, the width W1 of the bottom wall of the first dispersion hood 34 is 800mm, and the difference ΔL between the length of the top wall and the bottom wall of the tip is 100mm. The length of the second suction pipe 32 is less than the length of the first suction pipe 31, which is less than the length of the third suction pipe 33. The second dispersion hood 35, the first dispersion hood 34, and the third dispersion hood 36 are spaced apart along the second horizontal direction b.

[0089] The first suction pipe 31 includes a first inlet straight pipe 311, a first bend section 312, a first straight pipe section 313 and a second bend section 314 connected in sequence on the same horizontal plane; the second suction pipe 32 includes a second inlet straight pipe 321, a third bend section 322 and a second straight pipe section 323 connected in sequence; and the third suction pipe 33 includes a third inlet straight pipe 331, a fourth bend section 332, a third straight pipe section 333 and a fifth bend section 334 connected in sequence on the same horizontal plane. The first bend section 312, the third bend section 322, and the fourth bend section 332 are arranged side by side. The first bend section 312 bends downward away from the third bend section 322, the third bend section 322 bends downward, and the fourth bend section 332 is arranged symmetrically with respect to the first bend section 312 about the central axis of the first inlet straight pipe 311. Furthermore, the bending angle between the fourth bend section 332 and the first bend section 312 should not be too large to avoid making the suction assembly 3 too large; it is sufficient that the adjacent air inlet pipes are positioned so as not to interfere with each other. The first inlet straight pipe 311 and the first straight pipe section 313 extend along the second horizontal direction b, respectively. The second bend section 314 connects the first straight pipe section 313 and the first dispersion hood 34. The axes of the second inlet straight pipe 321, the third bend section 322, and the second straight pipe section 323 are in the same vertical plane. The second inlet straight pipe 321 and the second straight pipe section 323 extend along the second horizontal direction b, and the second straight pipe section 323 is connected to the second dispersion hood 35. The third inlet straight pipe 331 and the third straight pipe section 333 extend along the second horizontal direction b, and the fifth bend section 334 is used to connect the third straight pipe section 333 and the third dispersion hood 36. The suction assembly 3 of this solution has a compact structure and simple airflow distribution, and can be applied to the bag filter 100 with limited space.

[0090] The inner diameter of the first suction pipe 31, the second suction pipe 32, and the third suction pipe 33 is R1 = 390 mm. The bending radius of the first bend section 312 and the fourth bend section 332 is R2 = 195 mm, the bending radius of the third bend section 322 is R3 = 100 mm, and the bending radius of the second bend section 314 and the fifth bend section 334 is R4 = 205 mm. When viewed from above, the maximum angle α between either the first bend section 312 or the fourth bend section 332 and the first suction pipe 31 is 39.12°. When viewed directly from the inlet end of the suction pipe, the angle β between either the first bend section 312 or the fourth bend section 332 and the first suction pipe 31 is 28°.

[0091] The guide plate 37 includes a first horizontal plate 371, a vertical plate 372, and a second horizontal plate 373 connected in sequence. The first horizontal plate 371 is located above the second horizontal plate 373. The width of the first horizontal plate 371 and the width of the second horizontal plate 373 extend along the second horizontal direction b, respectively. The vertical plate 372 extends in the vertical direction. The width of the first horizontal plate 371 is 50 mm, the height of the vertical plate 372 is 250 mm, and the width of the second horizontal plate 373 is 30 mm.

[0092] In the second dispersion hood 35, there are three guide plates 37, with two guide plates 37 located above the first ash hopper 1 and the remaining guide plate 37 located above the second ash hopper 1. In the first dispersion hood 34, there are three guide plates 37, with two guide plates 37 located above the third ash hopper 1 and the remaining guide plate 37 located above the fourth ash hopper 1. In the third dispersion hood 36, there are three guide plates 37, with two guide plates 37 located above the fifth ash hopper 1 and the remaining guide plate 37 located above the sixth ash hopper 1. In each dispersion hood, the height difference of the first transverse plate 371 between two adjacent guide plates 37 is ΔH, and the cross-sectional area of ​​the outlet end of the corresponding suction pipe corresponding to the height difference ΔH is S1. The total cross-sectional area of ​​the outlet end of the suction pipe is S2, where S1 = S2 / (n+1), and n is the number of guide plates in the dispersion hood.

[0093] Simulation calculations were performed using the fluid simulation software Fluent, and the results are as follows:

[0094] (1) Figure 10 The diagram shows the velocity distribution cloud map of the mid-section of the bag filter. It can be seen from the figure that the positions of the three dispersion hoods and the airflow dispersion effect indicate that the bag filter 100 of this embodiment has good uniformity of longitudinal and transverse ash load, and no abnormal vortex flow or velocity zone.

[0095] (2) Figure 11 The vector diagram shows the velocity of the bag filter 100. It can be seen from the diagram that the resistance of each section of the pipeline is balanced, the airflow velocity of the three suction pipes and the three dispersion hoods is balanced, and the dirt is sucked up evenly.

[0096] (3) Figure 12 The graph shows the velocity distribution at a cross-section 100mm below filter chamber 2. As can be seen from the graph, the maximum velocity is 7m / s, which meets the filtration working conditions.

[0097] (4) Figure 13 The cloud diagram representing the airflow velocity shows that the bag filter 100 of this embodiment has good uniformity in both longitudinal and transverse ash load.

[0098] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations included in the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this utility model that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of this utility model and do not limit the scope of protection of this utility model patent.

Claims

1. A bag filter for a railway track bed vacuum truck, characterized in that, The bag filter (100) includes: Multiple ash hoppers (1) are used to collect waste; Multiple filter chambers (2) are used to filter dust-laden airflow; The suction assembly (3) is located between the plurality of ash hoppers (1) and the plurality of filter chambers (2); the suction assembly (3) includes a plurality of dispersion hoods and a plurality of suction pipes arranged side by side along the first horizontal direction (a), the outlet end of each suction pipe is connected to a dispersion hood, and the opening of the dispersion hood faces downward. The outer casing (4), the plurality of filter chambers (2) and the suction assembly (3) are all located inside the outer casing (4), and the plurality of ash hoppers (1) are connected to the lower part of the outer casing (4); The plurality of ash hoppers (1) are divided into multiple ash hopper groups along the airflow direction, and each ash hopper group includes at least two adjacent ash hoppers (1); each ash hopper group is matched with at least one dispersion hood, and the inlet of each ash hopper (1) in the ash hopper group is opposite to the opening of the corresponding dispersion hood. The dispersion hood is provided with multiple guide plates (37), which are arranged vertically and are spaced apart along the airflow direction. The height of the multiple guide plates (37) increases sequentially along the airflow direction. The multiple guide plates (37) are used to make the airflow entering the dispersion hood slow down and disperse evenly in the dispersion hood before flowing downward.

2. The bag filter for a railway track bed vacuum truck according to claim 1, characterized in that, The plurality of ash hoppers (1) are distributed sequentially along the second horizontal direction (b), and the plurality of filter chambers (2) are distributed sequentially along the second horizontal direction (b) and are arranged one-to-one above the ash hoppers (1).

3. The bag filter for a railway track bed vacuum truck according to claim 2, characterized in that, All the dispersion shields are spaced apart along the second horizontal direction (b); And / or, the second horizontal direction (b) is perpendicular to the first horizontal direction (a).

4. The bag filter for a railway track bed vacuum truck according to claim 1, characterized in that, The longitudinal section of the top of the dispersion hood is inverted V-shaped.

5. The bag filter for a railway track bed vacuum truck according to claim 2, characterized in that, The suction assembly (3) includes a first suction pipe (31), a second suction pipe (32) and a third suction pipe (33) arranged side by side in a first horizontal direction (a). The outlet end of the first suction pipe (31) is connected to a first dispersion hood (34), the outlet end of the second suction pipe (32) is connected to a second dispersion hood (35), and the outlet end of the third suction pipe (33) is connected to a third dispersion hood (36). The length of the second suction pipe (32) is less than the length of the first suction pipe (31) and less than the length of the third suction pipe (33). The second dispersion cover (35), the first dispersion cover (34) and the third dispersion cover (36) are spaced apart along the second horizontal direction (b).

6. The bag filter for a railway track bed vacuum truck according to claim 5, characterized in that, The number of ash hoppers (1) and the number of filter chambers (2) are both six. The six ash hoppers (1) are divided into a first ash hopper group, a second ash hopper group and a third ash hopper group along the airflow direction. Each ash hopper group includes two ash hoppers (1). The openings of the first dispersion hood (34) are respectively opposite to the two ash hoppers (1) of the first ash hopper group, the openings of the second dispersion hood (35) are respectively opposite to the two ash hoppers (1) of the second ash hopper group, and the openings of the third dispersion hood (36) are respectively opposite to the two ash hoppers (1) of the third ash hopper group.

7. The bag filter for a railway track bed vacuum truck according to claim 6, characterized in that, The first suction pipe (31) includes a first inlet straight pipe (311), a first bend section (312), a first straight pipe section (313) and a second bend section (314) connected in sequence. The second suction pipe (32) includes a second inlet straight pipe (321), a third bend section (322) and a second straight pipe section (323) connected in sequence. The third suction pipe (33) includes a third inlet straight pipe (331), a fourth bend section (332), a third straight pipe section (333) and a fifth bend section (334) connected in sequence. The first bend (312), the third bend (322), and the fourth bend (332) are arranged side by side. The first bend (312) bends downward in a direction away from the third bend (322). The third bend (322) bends downward. The fourth bend (332) and the first bend (312) are arranged symmetrically about the central axis of the first inlet straight pipe (311). The first inlet straight pipe (311) and the first straight pipe section (313) extend along the second horizontal direction (b), and the second bend section (314) is used to connect the first straight pipe section (313) and the first dispersion hood (34); the axes of the second inlet straight pipe (321), the third bend section (322) and the second straight pipe section (323) are in the same vertical plane, the second inlet straight pipe (321) and the second straight pipe section (323) extend along the second horizontal direction (b), and the second straight pipe section (323) is connected to the second dispersion hood (35); the third inlet straight pipe (331) and the third straight pipe section (333) extend along the second horizontal direction (b), and the fifth bend section (334) is used to connect the third straight pipe section (333) and the third dispersion hood (36).

8. The bag filter for a railway track bed vacuum truck according to claim 7, characterized in that, The inner diameters of the first suction pipe (31), the second suction pipe (32), and the third suction pipe (33) are equal, and the inner diameter R1 ≤ 450 mm; The bending radii of the first bend (312) and the fourth bend (332) are equal, and 175 mm ≤ bending radius R2 ≤ 215 mm; the bending radius of the third bend (322) is R3, and 90 mm ≤ bending radius R3 ≤ 110 mm; the bending radii of the second bend (314) and the fifth bend (334) are equal, and 185 mm ≤ bending radius R4 ≤ 225 mm.

9. The bag filter for a railway track bed vacuum truck according to any one of claims 1-8, characterized in that, The guide plate (37) includes a first horizontal plate (371), a vertical plate (372), and a second horizontal plate (373) connected in sequence. The first horizontal plate (371), the vertical plate (372), and the second horizontal plate (373) together form a cavity (374), and the opening of the cavity (374) is opposite to the outlet end of the corresponding air suction pipe.

10. The bag filter for a railway track bed vacuum truck according to claim 9, characterized in that, The outlet end of the suction pipe extends along the second horizontal direction (b), the first horizontal plate (371) is located above the second horizontal plate (373), the width of the first horizontal plate (371) and the width of the second horizontal plate (373) extend along the second horizontal direction (b), and the vertical plate (372) extends along the vertical direction; the width of the first horizontal plate (371) is greater than the width of the second horizontal plate (373); the second horizontal direction (b) is perpendicular to the first horizontal direction (a); And / or, in the same dispersion hood, the height difference between the top walls of two adjacent guide plates (37) is ΔH, the cross-sectional area of ​​the outlet end of the suction pipe corresponding to the height difference ΔH is S1, the total cross-sectional area of ​​the outlet end of the suction pipe is S2, S1=S2 / (n+1), where n is the number of guide plates in the dispersion hood.

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